New Study Tracks Two Decades of US Immigration Policy Shifts and Their Growing Impact on Public Health Equity

Drexel University study maps 20 years of sanctuary laws, revealing how state and local immigration policies drive health outcomes and community trust.

By: AXL Media

Published: Apr 27, 2026, 5:57 AM EDT

Source: Information for this report was sourced from EurekAlert!

Mapping Twenty Years of Legislative Friction

A comprehensive analysis of state and local immigration laws has revealed a rapidly hardening legal landscape in the United States since the September 11 terrorist attacks. Led by Caroline Kravitz of Drexel University, the study identifies a significant shift in how jurisdictions utilize law enforcement cooperation with federal agencies like Immigration and Customs Enforcement (ICE). Researchers tracked 27 state anti-sanctuary policies and 25 sanctuary policies between 2009 and 2021, alongside 284 local agreements. This legislative mapping provides a framework for understanding how the push and pull between federal, state, and local governments creates a patchwork of legal environments that dictate the daily lives of millions of residents.

The Rise of Punitive State Control

One of the most striking trends identified in the data is the emergence of "punitive preemption," a mechanism where state governments use the threat of punishment to discourage local policy action. While common in anti-sanctuary states, this tactic was notably absent in sanctuary states. Senior investigator Alina Schnake-Mahl noted that these actions often fluctuate based on the party in power at the federal level, with states frequently enacting laws ideologically opposed to the current administration. This chilling effect on local policymakers reduces their autonomy to create public health initiatives, as local officials often fear retribution from the state for attempting to provide inclusive services.

Quantifying Health Disparities in Enforcement Zones

The researchers emphasize that these legal distinctions are not merely administrative but have profound physical and mental health consequences for immigrant communities. Anti-sanctuary policies, which mandate cooperation with federal immigration authorities, are linked to increased rates of post-traumatic stress disorder, anxiety, and depression. Furthermore, these environments often lead to the avoidance of essential safety net programs and healthcare services due to a heightened fear of deportation. By creating a climate where immigrants feel unwelcome, these policies can exacerbate chronic illnesses and widen the health equity gap between different segments of the population.